Flatness measuring device for constructional engineering

The invention provides a flatness measuring device for constructional engineering, and belongs to the technical field of constructional engineering. Comprising a mounting base, a moving groove is formed in the middle of the mounting base, a measuring assembly is arranged in the moving groove, a marking pen is arranged at the top of one side of a measuring block, a paper storage box is arranged above one side of the mounting base, a plurality of pieces of recording paper are arranged in the paper storage box, and a push plate is arranged on one side of the recording paper. A pressing assembly is arranged at the joint of the push plate and the paper storage box, a cleaning assembly is arranged on one side of the measuring block, and fixing assemblies are arranged at the four corners of the mounting base. Through the arrangement, flatness measurement can be simpler and quicker, meanwhile, the surface needing to be measured can be cleaned in the measurement process, it is effectively avoided that residual cement